Airstrikes by Syrian jets and shells from tanks leveled a neighborhood in a restive city near the capital of Damascus on Tuesday, killing 18 people, activists said.

The airstrikes on the city of Douma, northeast of the capital, left residents scampering over a huge expanse of rubble and using their hands to dig up mangled bodies, according to activist videos posted online.

Scenes of vast destruction like those from Douma on Tuesday have grown more common as rebels seeking to topple President Bashar Assad have made gains on the ground, and Assad's forces have responded with overwhelming air power.